"use strict";
const { Model } = require("sequelize");
module.exports = (sequelize, DataTypes) => {
  class Category extends Model {
    /**
     * Helper method for defining associations.
     * This method is not a part of Sequelize lifecycle.
     * The `models/index` file will call this method automatically.
     */
    static associate(models) {
      // define association here
      models.Category.hasMany(models.Course,{as:'courses'})
    }
  }
  Category.init(
    {
      name: {
        type: DataTypes.STRING,
        allowNull: false,
        // 数据校验
        validate: {
          notNull: { msg: "分类名称必须填写" },
          notEmpty: { msg: "分类名称不能为空" },
          len: { args: [2, 45], msg: "分类名称长度在2~45个字符之间" },
          async isUnique(value) {
            const category = await Category.findOne({
              where: {
                name: value,
              },
            });
            if (category) {
              throw new Error("分类名称已存在");
            }
          },
        },
      },
      rank: {
        type: DataTypes.INTEGER,
        allowNull: false,
        validate: {
          notNull: { msg: "分类排序必须填写" },
          notEmpty: { msg: "分类排序不能为空" },
          isInt: { msg: "分类排序必须为整数" },
          isPositive(value) {
            if (value <= 0) {
              throw new Error("分类排序必须为正整数");
            }
          },
        },
      },
    },
    {
      sequelize,
      modelName: "Category",
    }
  );
  return Category;
};
